Commutator-brush for dynamo-electric machines.



W. Zim PD. AJ. w M. 5, d Du. @d m Y A n M D T Duw A ...w P m R. .N. BAYLIS. GOMMUTATOR BRUSH FOR DYNAMO ELECTRIC MACHINES APPLICATION FILED APB.10. 1905.

ROBERT N. BAYLIS, OF ENGLEWOOD, NEW JERSEY. I

COMNlUTATOR-BRUSH FOR DYNANlO-ELECTRIC MACHINES.

Specification of Letters Patent.

Patented March 5, 190'?.

Application filed Akpril I 1905. Serial No. 254.634.

Tc a/Zl L11/1:0717, it may concern:

Be it known that I, ROBERT N. BAYLrs, a

citizen of the United States, residing at En-.

glewood, Hudson county, State of l\ ew Jer- 5 sey, have invented certain new and useful Improvements in Oommutator-Brushes for Dynamo-Electric Machines, of which the following is a full, clear, and exact description.

My invention relates to commutatorro brushes for dynamo-electric machines, and

particularly to a shunt connection therefor.

The object of the invention is to provide a liexible shunt connection between the sta tionary and movable parts of the holder and r 5 brush with means for securing the connection to the brush so that electrical contact is perfected while maintaining the simplicity of the device and economy of construction.

The invention consists in improvements zo the principles of which are illustrated in the accompanying single sheet of drawings.

Briey, it comprises a brush and a flexible shunt having its end inserted in a passage in the brush and expanded therein by a z 5 spreader, the parts being supported by a suitable holder, to which it is connected and through which the current passes.

Figure 1 illustrates my invention as applied to a brush and holder and in engagement with a fragment of the commutator. Fig. 2 is a sectional view of the brush and a fragment of the conductor secured therein. Fig. 3 is a view of the brush and fragment of the conductor from the opposite side from that shownin Fig. 1. Fig. 4 shows a spreader for securing the conductor in the brush. Fig. 5 isa sectional view of a modified form of brush and conductor, the conductor being shown in elevation. Fig. 6 is an edgeview 4Q of the brush and conductor shown in Fig. 5. Fig. 7 is a view of the spreader employed in the construction shown in Figs. 5 and 6.

l is the body of the brush-holder, preferably of metal, whichis clamped to a stationary stud 2 by screw 3.

4 represents a fragment of the commutator of a dynamo-electric machine with which the invention is adapted to be employed.

5 is the brush of suitable construction-for instance, of carbon plated with copper-and adapted to bear upon the commutator.

6 is an arm pivotally carried by the body l and pressed forward by the spring 7, so as to 5 5 bear upon the brush 5 and ho d it in contact. Current passes from the terminal stud through the body l and the brush 5 to the commutator.

8 is a shunt connection, preferably of flexi-4 ble wire, such as a braided tube, having a connecting-plate 9 at one end, which is clamped to the bodyl by nut 10. 'lhe brush end of the connection is inserted in a passage drilled laterally through the brush 5 and expanded into intimate contact with the walls thereof by means of a spreader-pin 11, which is inserted in the open end of the hollow or tubular braid and driven tightly in place. The end of the brush is preferably cut back, as at 1,2, so as to afford clearance-space for the thickness of the conductor 8 in case a series of brushes are arranged side by side. The principal portion of the current is then shunted by this connection 8 to the brush 5, so as to insure greater uniformity of action and to reduce losses.

The invention thus will be seen to reside in the employment of a substantial exible tubular braided conductor which does not ma terially interfere with the movement of the brush 5 and which is secured in intimate contact in a cavity in the brush by means of a spreader, so as tocarry the electric current.

That I claim is- 1. In a device of t-he character described, a brush having a perforation extending laterally through the same, a flexible conductor of braided wire having a continuous tubular end arrangedto be inserted within the said passage from one side, and a pin-like expander or spreader arranged to be inserted into said passage from the opposite side and into the open end of the tubular portion of said conductor to hold the same in intimate and uniform contact against the wall of the perforation.

2. In a device of the character described, a brush having a perforation extending laterally through the same, a flexible conductor of braided wire having a continuous tubular end arranged to be inserted within the said passage from one side, and a pin-like expander or spreader arranged to be inserted into said passage from the opposite side and into the open end of the tubular portion of said cor ductor to hold thesame in intimate and uniform contact against the wall of the perforation, and a clearance-space at one side of the brush arranged to receive the projecting portion of the conductor.

3. In a device of the character described, a brush having a perforation4 extending IOO IIO

through the saine, a flexible conductor of braided Wire havinga continuous tubular end arranged to be inserted within said pas sage, anda pinlile expander or spreader are ranged to be inserted into said tubular portion to expand the saine and to force it into intimate and uniform Contact against the Wall of the perforation and entirely around said pin.

4. In a device of the character described, abrush having a hole extending into the same,. a. flexible conductor of braided Wire ROBERT N. BAYLIS.

W'itnesses:

Ri C. MITCHELM L. VREELAND. 

